Intertooth scraper for excavating implements



Feb. 2, 1932.

INTERTOOTH SCRAPER FOR EXCAVATING IMPLEMENTS J. O'F. CLARK Filed Dec. 3. 1927 Patented Feb. 2, 1932 some o'rennon I 01 ST. LOUIE, MISEO'URI,

ASSIGNOR TO AMERICAN HANGAWQE STEEL COMPANY, E CHICAGO, ILLINOIS, A CORPORATION '01? MAINE H'I'ER'I'DQTH SURAPEB FOB EXCAVATDTG mums-inns Application flied December :2, 1927. Serial m. 237,403.

This invention relates to excavating implements, such as ower operated clippers, buckets, and the li e, in which the digging lip is provided with teeth to increase the dig- & ging eficiency; and the invention has for its primary object to provide separately formed members entering into assembly with the intor-tooth spaces of thelip for the purpose of protecting the same from wear, as well as l (in the preferred embodiment of the invenadapts them for 'plementery naemhers in such tion} providing scrapers which add digging eficiency to the lip and by their ready replaceability adapt the lip to be kept up to such eficiency; a collateral ohject oi the inventionheing to so construct replaceable intor-tooth lip members or scrapers, as well as the teeth hetween which they are used, that an inter-engagement will be established between thorn, whereby the teeth will serve to hold the lip members or scrapers in position upon the implement by more placement of the parts into sssemhly and us a step in mounting least one of the teeth upon the implement, as distinguished irorn the more complicated and less reliable principle of first mounting the teeth upon the implement and then. rigidily securing the separately formed lip memher to the teeth, which necesssrily involves additional, separately formed assernhly parts that may become loose or wear away in service.

In carrying out the invention, the replaceshle lip members areformed separately from the lip and the teeth, with e design that rearward seating against the lip of the implement, and also for interengagement lsterully with teeth between which they are, respcctivcl located, the teeth being likewise designs to act as cominter-engagement, so that the separately formed lip momhers will he held in placehy the act of prepportioning each separately erly assembling thorn an securing the teeth to the implement; the inter-engagement, in the preferred emhodiment, consisting in proformed lip men her so that it will hridge the distance between two teeth, and forming upon the sides of the member laterally extending lugs which enter into recesses in the sides of the teeth,

such recesses being preferably at the forward ends of the crotches through which the teeth embrace the lip scraping function of the separately formed lip members being afforded by a blade extending forwardly and preferably inclined downwardl from the portion of the lip member which carries the lugs.

In the accompanying drawings Figure l is a perspective view showing a typical form of excavatin implement, towit, a power operated dip or, to which the subject-matter of the present invention is applied, by way of illustration.

Figure 2 is e side elevation, on an enlarged scale, of one of the digging teeth employed in the embodiment shown in Figure l.

. Figure 3 is a plan view of the tooth shown in Figure 2, together with fragmentary portions or separately formed lip members that enter into engagement with the tooth, on either side thereof.

Figures land are, respectively, a top plan View and a side elevation of one of the intertooth separately formed lip members.

A represents the body of s power operated dipper which typifies a class of excavating implements to which the present invention may be applied, and B represents digging lip of such an implement.

it represents digging teeth which are essentielly wedge-shaped members mounted upon the lip B, and which are commonly constructed with spaced arms or ten s 2 which to other provide a bifurcated ass with em racing crotch 3, tied together against spreading through moons of the web 4, and assembled with the implement by ontering into embrace with the lip B in spaced positions defined by slots (not shown) that receive the webs According to the present invention, lip B has mounted upon it, in addition to the digging teeth 1, separately formed lip members 5, the preferred construction of which is best shown in Figures 4 end 5, according to which each member 5 has a concave seat 6 at its rear end, has a main transverse horizontal dimension corresponding to the distance be tween two teeth 1, end has upon the rear pen of the implement; and the till too

- tionsof its sides tooth engaging ln forward main portion of the ha y of the member 5 is designed to provide a sore er 5a, and is given such inclination with re erence to they horizontal that it will'function as a displacing and lifting element in guidiin materlal into the'implement. I ct erwise embodying any approved (i651 ada ting them for proper assembly with t e imp ement, involve the novelty of having upon their lateral faces, through which they meet the separately iormed lip members 5,

means for inter-engaging with the members 5, whichaneans when used in connection with the form of lip member illustrated, consists of recesses 8 in which the lugs 7 fit, so pos1- v f teeth and .hp

placement, when the concave seats 6 are resting against the forward margin of the implement lip B,

resultin from encountered material is borne by the lip B, said members. 5

angular presentation that a apts them to serve the purposes for which they are inally tended.

' Inasmuch as teeth 1,'as is usual, are relaceably secured to the implement A, it folows that the separately formed lip members 5 may be renewed as often as required (usuwhenever the teeth lare replaced), an phe lige of the lip B. is correspondingly proonge The design of the niembers 5 is such that they respond well to heat treatment which is indispensable in the production of the parts from manganese steel, which'is the most desirable material for the purpose, and the re." cesses 8 which receive the lugs 7 facilitate heat treatment .of the teeth 1, in that they re-' duce the metal mass at pointsof maximum.

thickness. Ielaima-v 1. In an excavating implement, digging -teeth, -mounted' upon said implement, with a space between them, formed 1i and a separately an interembrace. between them.

2. An excavating implement having spaced teeth, an intervening separately formed lip member and means constituting an independent interembrace between said lip member and each tooth member; said means comprising' a projection on one part and arecess on the other part, receiving said projection; and at least one projection and the recess which receives it being adapted for. assembly by the 7. The

Teeth 1,.

plement with a space and hold the members 5 in I such assembly that while rearward thrust through are firmly held against tipping and with a (predetermined -member located in said space;- each of said teeth'and the adjacent portion the implement.

mdvement of the tooth which'assembles the tooth with the implement.

3. In combination with an excavating implement, digging teeth mounted at spaced mtervals thereon, and separately formed members constructed to seat against portions of the implement. which are between theteeth; said teeth being held on' the implement independently of and constructed to embrace sai separately formed members and hold them ingbearing upon the implement. 4. In combination with an excavating implement, digging teeth mounted on said imbetween them, and a separately formed lip member located in said space and held in position by said teeth; said lip directions perpendicular to'the plane of the lip member, in both lateral directions in said plane, and in the forward directions in said plane; and said lip member having a seat which it bears rearwardly against the implement to prevent its displacement in that direction.

5. In combination, an excavating implement, separately formed digging teeth constructed for attachment tosaid implement,

said teeth having recessed sides, and sepa--- rately formed lip members bridging the spaces between the teeth and having laterally presented lugs entering the recesses in the, 1 sides of the teeth whereby the li members are held in position upon the imp ement.

6. In combinationwith an excavating, implement, bifurcated digging teeth havin crotches through which they embrace sai implement and constructed at the 'forward ends of their crotches with laterally premember being constructed to inter-engage and prevent displacement of the member relativelyto the teeth in both sented scraper receiving recesses, and scrapers adapted to the portions of the implement which lie between said teeth, entering'said recesses, and there secured in place. 7. In combination with an excavating implement having a forward1y presented'lip,

digging teeth mounted upon said lip at spaced intervals, and separately formed lip members seating rearwardly against said lip, in the spaces between the teeth; said teeth having recesses through which they receive and embrace said separately formed lip members and hold the latter seated againstthe lip.

8. As an article of manufacture, a lip memher-for toothed excavating implements, sai lip member comprising a separately formed piece adapted to enter between two teeth of the implement and constructed at its inner end with a seat through'whi'ch itis adapted to bear rearwardly against the implement and at its sides with 'means is. adapted to interengage with two adjacent teeth and wherebyit is held seated against 9.1M an article of; manufacture, an inter through which it tooth lip member for toothed excavating implemcnts, comprising a separately formed piece constructed with a forwardly extend-= ing scraper, a rearwardly presented seat adapted to receive the forward margin of the implement, and laterally presented attaching lugs adapted for interengagement by two adjacent implement teeth for holding the lip member in position.

10. As an article of manufacture, a tooth for excavating implements, comprising a body portion adapted for assembly with the digging lip of an implement, and having its side Which lies forward of the lip when the tooth is in position, a laterally opening reccss to receive a separately formed lip mem-. her and engage said lip member rearwardly and prevent forward displacement of the lip member when the parts are in position.

11. As an article of manufacture, a bifurcated digging tooth for excavating implements, having a. lip-receiving crotch, and, forward of the end of said crotch, laterally presented recesses for the reception of separately formed lip members.

Signed at St. Louis, Mo., this eleventh day of October, 1927.

JOHN OFALLON CLARK. 

